可以根据需要添加任意数量的数据过滤器。
列表理解用作数据过滤器是相当方便的。
List comprehensions are quite convenient as data filters. In essence, ElementTree works the same way.
要对数据库执行更复杂的查询,必须定义元数据过滤器。
To perform more complex queries against the database, you must define filters against the metadata.
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